オーステナイトステンレス鋼の組織安定性及び機械的性質に及ぼす合金元素の影響(<特集>ステンレス鋼)

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A study was made of the effects of Ni on the deformation-induced martensitic transformation and mechanical properties of 18Cr-Ni, 18Cr-2Mo-Ni, 18Cr-4Mn-Ni, and 18Cr-5Mn-0.25N-Ni austenitic stainless steels. The deformation-induced martensitic transformation was discussed in terms of stacking fault energy and chemical free energy difference (⊿Gα′→γ). Furthermore, the influence of microstructure of austenitic stainless cast steels on mechanical properties was investigated. The results obtained are as follows : 1) With increasing Ni contents, the mode of deformation-induced martensitic transformation changes from the reaction of γ→ε′→α′ to the one of γ→α′. 2) The amount of ε′ martensite of speciments strained to 20% at -180℃ shows a peak value at a particular Ni content which is characteristic of each series. 3) 0.2% proof stress varies with the test temperature and Nicontent. With decreasing Ni content of metastable austenite, 0.2% proof stress lowers and it is supposed that this cause is due to γ→ε′ martensitic transformation. 4) Martensite transformation during Charpy test gives no effect on the impact value at -196℃, and it depends only on the toughness of austenite at the test temperature. 5) δ ferrite exists in cast steels because of the segregations and transforms to σ phase. Charpy impact value lowers as ferrite percentage increases in 18Cr-Ni cast steels and so dose σ phase in 18Cr-2Mo-Ni cast steels.
社団法人日本鉄鋼協会の論文
1977-04-01

オーステナイトステンレス鋼の組織安定性及び機械的性質に及ぼす合金元素の影響(<特集>ステンレス鋼)

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